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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed3c5a53e525ef8d9c3f240c2af23e8ee9f46739b38a8323a708e946309aa28' 
  AND token = 'eeIZXIXwCGvxOw8NPy+71SzlYOc2/JDHHYX6YpIcswc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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