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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830edaafaa0a17fba1c9e717b08f705f35d99ebb5e3331fc0b4cb2cd1daeb4cb' 
  AND token = 'bNKG53x5lDCjKeEV8Ot/OMeat9+Q7DhoeI/fOU4g2PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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