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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c41c9e4a9908174c1ecda4d8e61ee691bc422b122a9600b4d9304015ea5312f' 
  AND token = 'v7YoBgTZOixXyfGlokVyCgWXFoQFHz0ZBLnec8Bi8K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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