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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a670a02680b675d0bda750c8d654ac709c2bde4aab710774b3a2de0a50cecf13' 
  AND token = '2S9fPDKDsIcm+F9A8/sX1/s+KlOqFGBqyvR+VuyhrPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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