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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5638dcf141813729d2136a1d814809f9926ba1bba3049408768ddd706495e6ff' 
  AND token = 'XRe7SxGNXxzcaxvVhSQZCvlkC9gNxyxlEouwxL27vCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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