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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e288c22871a7a0c7d7c3f5b29264aae14870a08778f94777f2d02922cdaa34' 
  AND token = 'oxeMpD/xZU5gYrVjfGlu2xX9b4efa7X27dzHQnuo7cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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