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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fc8d061226b6daaaf4efb46c2a5a013a4c198e590c60f3657a1a67a6a08426' 
  AND token = 'TYYOkQIkXfRFhmdERSFw/E61r0RnJKGFLPYQhGSw9cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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