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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6301934d57c720662aa0a25e5e4c0b9698902e279361a8ef32228baf626921' 
  AND token = 'VgcKRRLsi8EIioUqFKfNT+i+UxqrXpfKxhoDLKy80XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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