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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e48351d472498e8aa62bab87f9992600ae51cd83ed84be988129a5d969cda5' 
  AND token = 'DcYwA2RezSzxhQiDBaY09X8ulCtQY1S55E+IHG9Z1cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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