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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56c40df408c934119de172ae54e1f3d5cea4697aab356175c1191a42b34b87e' 
  AND token = 'pbR4AOB99mnnxUcvPODOd79ZrI69UaoY4FkDDt+i9Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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