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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6620f777c1750b2877d5f78eda1b2bca9700ae0cbba40e8c614c0e393461f7' 
  AND token = 'Hf+kV8M61ezxQLxxYIzzmWDEgskHeeH4FETBuT04rV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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