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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0619313782e8eeaa621a0d6fda73193851a314c9f5506d4e5b6bdef3b3605d1' 
  AND token = 'DvbjG0OrYdY2Y5rL7auELnOzdi3JQ30RTViF0X6OTm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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