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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e828f6f2cad51ae3d32c48ed8e32206b017f1af6013c811f63757ee6ef62aee1' 
  AND token = 'fRTHY1SBxlLLM3R6DUP5XuV4AGV0tpuRhDe371el5lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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