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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6802670a089d3e609b0d4b9f01e237712b869ea3f72e2739b3d6f78f820c9a7' 
  AND token = 'B3QV9Wmc2pZUlz+qvuj65Bxeo78SVaT8hLH71YzkbBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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