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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e2170252f2c60c9298b5bf7ca57bb5589f9dbb7d38c747676aabee75cd49cc' 
  AND token = 'GSDly/HR0KMjTCSlelwRvgYnBfh1rEACUko6WjlTaqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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