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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f7a67af8c0ba06bb61f2fc00aa2eed3d5e59b6f41577a32d139052d712e4b7' 
  AND token = '7NW5CrXEbB6rQz5xTrcLuKW2DFl5ykfAiF7l4L/xH4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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