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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7773078580907f29e1a183534f62a19fe7fbe0d6aceaceb9cb1d108a104f514f' 
  AND token = 'T4UxbDPjlHZbjmlwND1bfyqdFOlzlU/mXJF452//z1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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