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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d7a6bfbf3cd7d6b2025b49a8be7fc7ce57871e4316c4f9bcd32f8396b270dd' 
  AND token = 'WhWoVtcmIRu4fonMzPvxgxcIGBjECT0p2+UWfuCxW5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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