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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6493687086f8f698ebc34ba5e7dbd411bcd9d45048545e24ba990c414c541aa' 
  AND token = 'V7xz0DwZ/4kL3sdkuQPiZHRECs9I5WA9H6zmSL2fOjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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