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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e87107a017b8c3d29d08e8b5890be1ce20830be5070b5a912d31f5a3e6784c' 
  AND token = 'gJts46lUfBPLk8FlzDKjkmH4v5eyNlBSlJZ7pYFQlCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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