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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237cf0e0c836b359eb4fd58712ad7857c3ceb4aa951fc84499de6a9958b46834' 
  AND token = 'CCPuLlXzVi66E0pPG2fKy5cpfWgKLzOdehwU6k4cnyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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