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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ce2f963709bddeab2aabdd64ab2372d44a0a18d596c2d0ea74b14bd02a1f32' 
  AND token = 'scmEsPf8NM2rNSLWgMy5eic6y9uujJY5O1J9ZTx5NUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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