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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e7dff061855bcca91d1970883aa67ce520bea418e75f8e7a326ec0264a747c' 
  AND token = 'rllA1nJ4rMf3DjltOTHs71S6m/VLFRsVhXUUGiZx0kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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