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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f2863cecd17e96c2baddad140e23596d949260b0d23450b90e4d014614293f' 
  AND token = '1BijWR9V/8FUKv4gEPFHFONZCF1U071kPWVZh3aFEpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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