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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4bd7fcb9a8dbe13d91dedc0da37c7829516654b83c1762499d8819a86ef78e' 
  AND token = 'p0bk03IaIEgOe4zyCZ69rLOI/VBDfqAHJ5BVXlX4alE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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