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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a428d069d9013a580c450b36fb86cda4331d8d4944ad5211640364c816110b' 
  AND token = 'g8L3y9n37UEqCOBamzzjrPqcl0gxeb14TjYeODyzjg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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