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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a040e956d958cf399656e713c712503517e70c50e801cdf2006f75570652ac53' 
  AND token = 'y42a5LoCepwyTKN1DyphM9Qngbz6rlx50dOR8YvdvFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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