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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8762d2a92d9c98e98633279f022c90b115b7a7046a7e156e74ee7d117d59d644' 
  AND token = 'gLthf8QoUlJn5AgE5b96RTwpySi3G+b6M0wie0DIx+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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