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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa9d09350ec28e349f75aae916ecaddb11b398451d0a3775d8e4e9072523ab3' 
  AND token = 'MmvuTxAkR0BQR5czVQlYFhgF0t29KyNeWJd8HHDYGRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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