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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cc166ce39ee2e5ce9d390cf0bcc9255f0b7d9dbfd6a9f020775743f5d70c3c' 
  AND token = '0XBn1QLd3t9SGPUWCWQ4Zo/1E+X+CubZwZs6Q4EtKZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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