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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c620ef1180239f259d3d28859761c378a66e19edd2dc918cb0f7cd1c23861cf4' 
  AND token = 'Wm8+Z0v4qlA9NF4vYxgSi8k8fWe8pzORCXdbO7HVAOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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