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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c686bfa31d86757f3df6c55e60fbaf6bc884fcb2659867c5152717d01eec8ea2' 
  AND token = 'WelEPhLLx5erlo5T4E9XJt3FtVEv+83mGpez5qo8iKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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