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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb8d269cd4153ed4d32fde39473d4d2fbb200b1f96ff4ee85a99435575ab5cd' 
  AND token = 'kuvEBFMWpQUwTDVWlJ52n5Mw7L4e1yPW+b8jXD5oMsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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