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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e552379642b741fca501b5c4556503a4c0f475b7a3ede3d584869e7abd21917' 
  AND token = 'w8uWYF9EL3zyamefxcnzVe2UdSrmoK2LlWXrgX2sZo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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