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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eaeb25543833f086e61d4303478639f20f579f03bdfd96ecec3fb6e604dfad3' 
  AND token = 'hRdNSdII2gJE9W9+F46v3dnNOaCtqHx6Aw+tcIXLZiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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