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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa939262839280e5129d123de747942a0f968194db7cda803b1bebe63135cfd' 
  AND token = '9T028LpHN5UCa2s+qZhO7w1OV9Szaq0J/99PaZjj+Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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