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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca7b19ccf05b2354a22d01cd7034e58cd65d98f9c583dc22ee4fed784eb1cc' 
  AND token = 'Iv3GWnHuuaFovBdB5nWYnoDVdXWWgCa3WbP8/3W5EM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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