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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7096fc0a351f37487ba5c99b4114c212efc8f96d30f17fed9392d21b35b96a33' 
  AND token = 'qS1mffA7RdG7zssIDDYHNAQDGN8wsGlxxWI24N10/A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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