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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2e5b9f7d9d11b822952848f6916ee0867200d2416ed1e0b1e9d3d45bd7dfa0' 
  AND token = 'jfCbjc9jKiTFuZc5v80QmPrfyO9sLUw1IjRtFabvV+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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