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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d98f24114c9f106d96240c55b4a932330e0775ae6891a90bc79e933376008d' 
  AND token = 'NCadc57yBcW6SHEmRQzumbLEATZ130vanMjcVUClBNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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