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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520012667ae65544b7d119d7ddd85c8bdbee66a392d9c28a829844d0a11877b3' 
  AND token = 'Fao5epAKley4Wd4SYMuv8L761hyENRX3oJYgKHAJv48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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