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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c0b91b7e399267168836ddc9d3abfb753bf4397b71b96f08c96ab33c4774a6' 
  AND token = 'XtzQT95XowtIapgCuXug0j00Qm0f0dzWOUySiU8dQ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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