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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae200991c1a79bd4a3211ed9c9e129284d02e48497a1b9df41a8c21ebb120fd' 
  AND token = '77W7ZByJIRYj6eXEHB3CHERDKYg2+GHTXjuJ5sNWzYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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