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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7da1bed85ab96b49431a955347a9694c4ac783759faed7759c812a1713fce8' 
  AND token = 'HpHbSk1rM3N25TKEZWY1b0/pn6gYMpxR2Y07WdVQWhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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