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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3db15af7bea197e48fa1e642b64b7eff69a724e2b2d0fa0ee2fa1afa9eef6c' 
  AND token = 'YUpFfwLCFBN0+IDzzRv8dUCeesQuDFkvXnGb1bsDB9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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