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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19cfbd69405d03e3ed53a968b575d50995c52b1a51817ed2e32649b14074ff4' 
  AND token = 'iyOjpJ/PP584E8sBbNicTAx7y6u8BPgyHm0wS3zUbTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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