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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c878e7b9934bee32cc33028615fa8c53cdd9c4d103ad0d8117a613e8e8e82b06' 
  AND token = 'VNQD4W+X4XAfdmEJfMPpxvLvQwi+3eZMXe36yFzkDL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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