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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f2e84ac76a6c74c1f79f0e210cd1bbf9a0de8c16130645286a9a0570369800' 
  AND token = '1kx7eW3UUa9Sucp0+a6xI+1iIB+ikfOwFPj8OBzi34M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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