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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ba8e7e7c71e0ee0ff1488de548b37fd36c07eb8cf23c39165b368f7d727dc5' 
  AND token = 'Pn/ym6vI3EjZZi+ArnzkBD7ycO1B+xeSnOrqDzknF7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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