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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fe870f75fa70ed5cb5d6d76f67c6dccd8e01540f8457e218f41d05b45ea2e3' 
  AND token = '96hKlLb4gnkfL+AImF3XSi6XvLPiIQGfo94y84+4HMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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