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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1ff5ad694ad6fc9eac01932b4adb06a270dd2e42c3883a9840e0dd37a7a4fd' 
  AND token = 'kwqL19e9tr4JBXarjwSbha+VEpapcuLufK6Ujf8gHJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}