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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af819ed6f29f7ac6789662f89cc192dc8b0505a54cfd033578dd83b9be25fbe' 
  AND token = 'nDNyBPWvtP0onk5yOvK+8SDJ23gFSlabCvbZv0Y2FBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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