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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15720c65e60bf3b72c06d65c5c8046057bbe18db2a6c0ea1e921dd260533119' 
  AND token = 'WC/tRZnC8G1ivgMcksX6VH/R2vceL/AAoZYzCsiHqj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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