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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1148d3837590df3df8911640a810cd998b876d4dbca6daa6d42ded900ddee393' 
  AND token = '3M6VJ2hz/AIBDmI1N1I7LMP4qxoeaYvNEUExkewygpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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