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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fba5091158fb0ede5d1a33d0dc83130eff89674d8a2d95c5a3cf2ba234d2cdc' 
  AND token = 'jaRIclVDwibZjLGjvDbMUbXdaq/AK9Cf0mCthubH9Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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