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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742102a6332b5a2359a4a1fbb5b53a516b453851c623843a77cf6862b786c01b' 
  AND token = 'LQIWdwKJEHQpjPYE1n+V4pwVJL3LZ32WKwTxNHoMNWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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