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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7d54701a08faf728ac72fd227ca0348abe0c89163d0fd3d567cc7eeb997796' 
  AND token = 'MnwyusB3xbrkaA5RkH2SgOUVdljU8/zAEunrvwdA9+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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