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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3bdb001b5c2e3ae59a3529650bed452d3484316599a54eb8868985d67849e0' 
  AND token = 'KGr34vjccOYE2ZTteRncdOo0oQVVp6HfG2axVZJQeeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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