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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c36b623c6b284c63043c50e73d0eef356492d2ac392d7b00b25e633a4e9390' 
  AND token = '85LkysuyUa/AIKe7G/E4iLnSh/vDHwiHXJMckyJCIXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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