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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fd6491e1fc4e279986398d4dc70d1f3fc85e3238fd1fd1c81c9cba0cd19a99' 
  AND token = 'w3dO8XZx8ybXWyGkSgUd7+Q4XH9qOKM0RsFdiMPcL0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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