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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50494d9ea6b21e6df80aec4fb1fbadb15997831e29707439959e43abc8d9b35b' 
  AND token = 'ekfa/fWhUZspa9qn/6QZQ3AXtXcuE1vXfgWvh6K4tmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00319

JSON explain

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