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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51be789f63362c999bb84ecd66e0a313dba401aaa43f5276cc49ab3e075a3a2b' 
  AND token = 'UbBVUYz6Q7JZ89im/Wz1wmoT23CzzsJSJSxkw9MTD6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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