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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58bd2b7257110c871c86d86fbc79e74d9927dfe587005a0fbcc6747c3fa954c' 
  AND token = 'OVKlinQETJBqy5500tGpG4av5fxZ0Ec/sLWirDCFVy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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