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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689ee65e6bb9b8c1d649d115eddd7e13f7f9c1b34d472e1c2d3537b85a601486' 
  AND token = '5dhrqi+BFT6eDbuPenlcWnJuXwq+KfqBltD18DXiySU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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