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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18cf4049073d09f202e4a150d6f350a1cc370393e46a92e0fbf89dc87331126' 
  AND token = 'Xk3/NR4Gg/34UaFJ8aIBte4o5iV7FwoF8fArN5NOjM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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