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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c7b68c95552550bc8fa9af24b1fa6a2d3cd617ae826cc195d5f29d82182661' 
  AND token = '8cnLvhBTYUonEvBfQen+6R2Z85GWvG/3CBvi9KeLZ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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